How to Choose a Self-Locking Push Button
Choosing a self-locking push button comes down to five things: whether you need latching or momentary action, how many poles the circuit needs, the mounting and pin format, the cap and travel your panel wants, and the current the contact will carry. Get those five right against your board and panel, and the rest is availability. Most Swiclick self-lock parts offer latching and momentary as an option on the same body, so the action is a choice you make per order, not a different part number to hunt down.
A self-locking push button stays in its pressed state until pressed again, unlike a momentary button that springs back on release. That difference decides the control, and this guide assumes you already know which action your design needs; if not, the self-lock switch overview covers latching versus momentary first. What follows is how to pick the actual part once the action is settled. The five choices below are the ones that send a design back for a re-order when they are missed, so work them in order before you commit.
1. Latching or momentary, and can one part do both
Decide the action first, because it defines the control: a power button that should stay on wants latching; a reset that should spring back wants momentary. The useful part is that many self-lock bodies offer both as an option, so you can standardize on one footprint and specify the action per build. That keeps a single part on the BOM even when different positions on the board need different behavior.
2. Poles: how many circuits it switches
Count the circuits the button has to make or break at once. A single pole switches one circuit; a double pole (DPDT) switches two independently, which is what you need to cut both a supply line and a signal, or to switch a load and light an indicator from the same press. Choosing single-pole to save cost and then finding you need a second circuit is a common re-spin.
3. Mounting and pin format
Match the mounting to the board and panel: through-hole for a strong mechanical anchor, surface-mount where the line is automated, and the pin count and pitch to the layout it drops into. A self-lock button with an integrated cap also has a body height and a panel cutout to check, so the button sits flush and presses cleanly.
4. Cap, travel and feel
The cap and travel are what the user actually touches. Check the cap interface if you are reusing an existing cap, the total height against the panel cutout, and the travel and force for the feel you want, firmer for a deliberate power switch, lighter for a frequently pressed control. A latching button that presses too stiffly is as much a complaint as one that feels loose.
5. Current and contact rating
Match the contact rating to the load. Most self-lock push buttons are signal-level or low-current parts, so confirm the rated current and voltage cover your circuit, and if the button switches a real load rather than a logic line, verify the rating with margin rather than running it at its limit.
FAQ
Latching, in most cases. A power control that should stay on until pressed again wants latching action; a control that should spring back, like a reset or a mode toggle held only while pressed, wants momentary. Decide the action first, then choose the part.
Often yes. Many self-lock bodies offer latching or momentary as an option on the same part, so you specify the action per order and keep one footprint on the BOM.
Yes. Double-pole versions switch two circuits from one press, which suits cutting a supply and a signal together or switching a load while driving an indicator.
Most are signal-level or low-current parts. Confirm the rated current and voltage for the specific model against your load, and leave margin if it switches anything beyond a logic line.
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Tell us your application and the specs you need, and our engineers will match a Swiclick switch and share its datasheet and pinout. Free samples ship 1 to 50 for validation before volume.
Written by Eric Chen, Application Engineer, Swiclick.
